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- January 3: W is formed.
- January 14: Berryz Koubou is formed
- January 19: Ise Layla was born.
- January 25: Abe Natsumi graduates from Morning Musume.
- February 9: Tamenaga Shion was born.
- February 28: Okamoto Honoka was born.
- March 16: Kitagawa Rio was born.
- April 19: Sato Hikari was born.
- April 20: Ishiguri Kanami was born.
- April 23: Kawano Minori was born.
- April 30: Yonemura Kirara is born.
- May 2:
- June: Hello Pro Kenshuusei is formed.
- June 29: Kitagawa Ryo was born.
- July 23: Kubota Nanami was born.
- August 1: Tsuji Nozomi and Kago Ai graduate from Morning Musume.
- August 10: V-u-den is formed.
- September 1: Doi Rena was born.
- September 28: Kudo Yume was born.
- October 20: Okamura Minami was born.
- November 1: Hashimoto Ririka was born.
- November 10: Kusunoki Mei was born.
- December 22: Kiyono Momohime was born.
- January 1: Sarasara no Kawa - Maeda Yuki
- January 21: Ai Araba IT'S ALL RIGHT - Morning Musume
- January 28: Kiseki no Kaori Dance. - Matsuura Aya
- February 4: Aegekai ni Dakarete - Iida Kaori (debut)
- February 11: Genki no Nai Hi no Komoriuta / Nagaragawa no Hare - Nakazawa Yuko
- February 25:
- March 3: Anata Nashide wa Ikite Yukenai - Berryz Koubou (debut)
- March 10: Hyacinth - Matsuura Aya
- March 17: Sayonara no LOVE SONG - Goto Maki
- April 21: Lucky Cha Cha Cha! - Minimoni
- April 28: Fighting Pose wa Date ja nai! - Berryz Koubou
- May 12: Roman ~MY DEAR BOY~ - Morning Musume
- May 19: Koi no Vacance - W (debut)
- May 26:
- June 2: Datte Ikitekanakucha - Abe Natsumi
- June 9: Namida no Taiyou - Melon Kinenbi
- July 7: Yokohama Shinkirou - Goto Maki
- July 14: YOUR SONG ~Seishun Sensei~ - Matsuura Aya
- July 22: Joshi Kashimashi Monogatari - Morning Musume
- July 28: Door no Mukou de Bell ga Natteta - Iida Kaori
- August 4: Shining Itoshiki Anata - Country Musume ni Konno to Fujimoto
- August 11: Koi no Telephone GOAL - Abe Natsumi
- August 18: Aa Ii na! - W
- August 25: Happiness ~Koufuku Kangei!~ - Berryz Koubou
- September 23: Koi no Nukegara - v-u-den (debut)
- September 29: Nishi Shinjuku de Atta Hito - Maeda Yuki
- October 6: Ren'ai Sentai Shitsu Ranger - Nochiura Natsumi
- October 14: Robo Kiss - W
- October 20: Watarasebashi - Matsuura Aya
- October 27: Champagne no Koi - Melon Kinenbi
- November 3: Namida ga Tomaranai Houkago - Morning Musume
- November 10: Koi no Jubaku - Berryz Koubou
- November 17: Sayonara "Tomodachi ni wa Naritakunai no" - Goto Maki
- November 26: Tensai! LET'S GO Ayayamu - Matsuura Aya and Ecomoni
- December 1: ALL FOR ONE & ONE FOR ALL! - H.P. All Stars
- January 1: ×3 - Matsuura Aya
- January 28: 2 Paint It Gold - Goto Maki
- February 4: Hitoribocchi - Abe Natsumi
- February 11: Minimoni Songs 2 - Minimoni
- March 3: JECICA - Michiyo
- March 31: Best! Morning Musume 2 - Morning Musume
- June 2: Duo U&U - W
- July 7: 1st Chou Berryz - Berryz Koubou (debut)
- July 22: Dai Nishou ~Tsuyogari~ - Nakazawa Yuko
- December 1: THE Nimaime - Melon Kinenbi
- December 8: Ai no Dai 6 Kan - Morning Musume
- December 15: Morning Musume EARLY SINGLE BOX - Morning Musume
- December 22: Petit Best 5 - Hello! Project
- December 29: Avenir ~Mirai~ - Iida Kaori
- April 3: Morning Musume CONCERT TOUR 2004 Haru The BEST of Japan
- May 28: Morning Musume DVD MAGAZINE Vol.1
- June 19: Morning Musume no Kiseni no Hoshi • Chikyuu ~Necchii Chikyuu wo Samasunda.~
- July 31: Morning Musume Tsuji☆Kago Sotsugyou Memorial
- August 21: Morning Musume DVD MAGAZINE Vol.2
- January 28: Morning Musume's Major Debut 6th anniversary
- September 14: Morning Musume's Formation 7th anniversary
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